Answer:
-1
Explanation:
If you're asking what S would have to be for the answer to be 3, then it's -1. First, you subtract the 7 that you added, giving you -4. Now, because we know that -4 is the product of 4 and -1, we know that -1 must be s. You can verify this by substituting the s for -1 and working out the problem to see if you get 3.